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Ion-Sink Phosphorus Extraction Methods Applied on 24 Soils from the Continental USA

^a Dep. of Agronomy, Throckmorton Plant Sciences Center, Kansas State Univ., Manhattan, KS 66506
^b USDA-ARS, Pasture Systems and Watershed Management Research Unit, Curtin Road, University Park, PA 16802-3702

View larger version (16K): [in a new window]   Fig. 1. (a) Regression of 3 RSBic–P and (b) the regression of FeO-P extracted in 24 h on that extracted in 16 h by the same method for 24 soils of the continental USA. 3-RSBic = three resin strips saturated with bicarbonate.

View larger version (26K): [in a new window]   Fig. 2. (a) Regression of RSBic–P on LRBic–P and (b) the regression of RSCl–P on LRCl–P for 24 soils of the continental USA. One, two, or three RS were used. Total surface areas were 17.3 cm2 for one RS, 34.5 cm2 for two RS, and 51.8 cm2 for three RS. Shaking times were 24 h for RS and 16 h for LR. RS = resin strip and LR = loose resin, Bic indicates bicarbonate saturation.

View larger version (20K): [in a new window]   Fig. 3. Regression of pH of the soil/solution matrix, at the end of the shaking period, on soil pH after using different ion sinks to extract soil P from 24 soils of the continental USA. Loose resin (LR) and three resin strips (RS) were saturated with either HCO3– or Cl–. FeO-coated paper was also used as an ion sink.

View larger version (24K): [in a new window]   Fig. 4. Regression of FeO-P on LRBic–P for 24 soils of continental USA. Shaking time was 16 h for LRBic and either 16 or 24 h for FeO-coated paper during the soil P extraction of 24 soils of continental USA. LRBic = bicarbonate saturated loose resin.

View larger version (28K): [in a new window]   Fig. 5. Regression of P recovery by five different ion-sink methods on standard P in solution. RS = resin strip and LR = loose resin, Bic indicates bicarbonate saturation, Cl indicates chloride saturation, the number preceding RS indicates the number of resin strips used.

View larger version (36K): [in a new window]   Fig. 6. Regression of extractable P from chemical tests on extractable P from ion-sink tests for 24 soils of continental USA. RS = resin strip and LR = loose resin, Bic indicates bicarbonate saturation, Cl indicates chloride saturation, the number preceding RS indicates the number of resin strips used.